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3 years ago

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Mathematics

1 answer:

prisoha [69]3 years ago

6 0

Answer: b+e= to 180 degrees

Explanation: angle b and e are supplementary, meaning they are the sun of 180 degrees.

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Help - i'll give brainliest

Serggg [28]

Answer:

W=91.2

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Nine times the difference between 4 and a number is24.what is the number.

melamori03 [73]

Answer:

9×24-4

216-4

212

Step-by-step explanation:

I am not sure, but it might help you

8 0

3 years ago

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Rearrange like terms in this polynomial so like terms are next to each other

mixer [17]

Answer:

4x^2 - 6x^2 -6x + 3x +3 - 4

Step-by-step explanation:

The terms here involve x^0, x, x^2.

Write the x^2 terms first: 4x^2 - 6x^2;

then write the x terms: -6x + 3x; and

then write the constants: 3 - 4

and so we have, in descending powers of x,

4x^2 - 6x^2 -6x + 3x +3 - 4

6 0

3 years ago

What should a size of a sample be in order to have a margin of error of 4% for a 90% confidence level from a population with a s

vagabundo [1.1K]

Answer:

We need a sample size of 2,071,800 or higher.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, we find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this problem:

We need a sample size of n or higher, when $M = 0.04, \sigma = 35$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.04 = 1.645*\frac{35}{\sqrt{n}}$

$0.04\sqrt{n} = 1.645*35$

$0.04\sqrt{n} = 57.575$

$\sqrt{n} = 1439.375$

$\sqrt{n}^{2} = (1439.375)^{2}$

$n = 2,071,800$

We need a sample size of 2,071,800 or higher.

6 0

3 years ago

The slope of the line that passes through the points (2,3) and (5,9) is

seraphim [82]

Answer:

The slope is 6/3 or simplified is 2

Step-by-step explanation:

Stick to this formula

y2-y1/

x2-x1

9-3/

5-2 = 6/3 or 2

See attachment for further explanation

Hope this helps (:

7 0

3 years ago